I have an ASUS P4P800-MX motherboard, 2.4 MHz P4, 256 MB RAM, 80 GB SATA HDD. It came to me non-operating. I checked the power supply, found it working, replugged everything and it worked. Today I installed 1 GB of DDR RAM, and it worked once, then failed to start up. Replaced the memory with the original 256M and it still doesn't start up. No beep codes, switched power supplies, no change. There are no expansion cards installed. Fans run, but no beep codes.
Suggestions?
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